Add group name badge under group milestone

app/views/shared/milestones/_milestone.html.haml

@@ -16,6 +16,9 @@
             = milestone_date_range(milestone)
         %div
           = render('shared/milestone_expired', milestone: milestone)
+          - if milestone.group_milestone?
+            .label-badge.label-badge-blue.d-inline-block
+              = milestone.group.full_name
           - if milestone.legacy_group_milestone?
             .projects
               - milestone.milestones.each do |milestone|

spec/features/dashboard/milestones_spec.rb

@@ -13,8 +13,10 @@ describe 'Dashboard > Milestones' do
 
   describe 'as logged-in user' do
     let(:user) { create(:user) }
+    let(:group) { create(:group) }
     let(:project) { create(:project, namespace: user.namespace) }
     let!(:milestone) { create(:milestone, project: project) }
+    let!(:milestone2) { create(:milestone, group: group) }
     before do
       project.add_maintainer(user)
       sign_in(user)
@@ -24,6 +26,7 @@ describe 'Dashboard > Milestones' do
     it 'sees milestones' do
       expect(current_path).to eq dashboard_milestones_path
       expect(page).to have_content(milestone.title)
+      expect(page).to have_content(group.name)
     end
   end
 end